CPC Subgroup
C02F 1/22 by freezing
Full Title
Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence) > by freezing
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C02F 1/22 Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence) > by freezing